Dom34は,3'の翻訳されていない領域のリボソームを救う
Nicholas R Guydosh1, Rachel Green1
1Howard Hughes Medical Institute, Department of Molecular Biology and Genetics, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.
Cell
|March 4, 2014
まとめ
タンパク質Dom34は,断片化されたmRNAと非コーディング領域から停滞したリボソームをin vivoで救出する. このプロセスはリボソームのリサイクルと細胞タンパク質合成のホメオスタシスの維持に不可欠です.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- タンパク質合成中のリボソームの停滞は,活性リボソームの細胞質プールを維持するためにリサイクルを必要とします.
- タンパク質Dom34は,共因子Hbs1およびRli1とともに,in vitroで停止したリボソームを分離することが知られている.
- リボソーム品質管理におけるDom34のインビボ標的と特異的な機能は,ほとんど特徴づけられていなかった.
研究 の 目的:
- リボソームの救済とリサイクルにおけるDom34タンパク質のインビボ機能を調査する.
- Dom34が停滞したリボソームに作用する特定のmRNAターゲットと細胞文脈を特定するために.
- リボソームが3' 未翻訳領域 (UTR) と結合するメカニズムを解明する.
主な方法:
- 拡張リボソームプロファイリングの方法論を使用して,Dom34機能の高解像度特徴を in vivo で達成しました.
- リボソームの占有率と分布をmRNAで分析し,コード配列と3' UTR を含む.
- 3' UTRsへのリボソームアクセスにおけるmRNAの解読の役割を調査した.
主要な成果:
- Dom34は,切断されたmRNAから停止したリボソームを積極的に除去します.
- Dom34は一般的に,ポリプロリンのような既知の問題のあるコーディングシーケンスに停滞したリボソームを分離しません.
- Dom34は,3' UTRsの近くで逮捕されたリボソームを標的とし,しばしばmRNAの解読を必要としません.
結論:
- リボソームは,mRNAの下流の非コーディング領域に頻繁に侵入する.
- Dom34は,非生産的に活動しているリボソームを救う上で重要な役割を果たします.
- Dom34のこの機能は,リボソームの効率的なリサイクルと,翻訳的忠誠性の維持に不可欠です.
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